Android Gradle:找不到符号变量

Question

使用gradle构建时出现错误,error: cannot find symbol variable [image_name].我正在使用ContextCompat.getDrawable(getActivity(), R.drawable.[image_name])我一直在谷歌上搜索,直到我发现这个方法得到一个drawable而不使用弃用的方法或将我的min sdk设置为21.但是现在,gradle说它找不到符号变量.我在drawable文件夹中有我的图像.如果您需要什么,请评论.

编辑:

res:
drawable(这里的图片)
drawable-hdpi
...

我的课:

import [package_name].R;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.content.ContextCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * A placeholder fragment containing a simple view.
 */
public class HomeActivityFragment extends Fragment {

public HomeActivityFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    String[] titleData = {"[TEXT]", "[TEXT]", "[TEXT]"
    };

    ArrayList<String> titles = new ArrayList<String>(Arrays.asList(titleData));

    Drawable[] imageData = {
            ContextCompat.getDrawable(getActivity(), R.drawable.seminar_cross_th),
            ContextCompat.getDrawable(getActivity(), R.drawable.media_th),
            ContextCompat.getDrawable(getActivity(), R.drawable.praise_th)
    };

    ArrayList<Drawable> images = new ArrayList<Drawable>(Arrays.asList(imageData));

    HomeAdapter homeListAdapter = new HomeAdapter(getActivity(), titles, images);


    View rootView = inflater.inflate(R.layout.fragment_home, container, false);

    // Get a reference to the ListView, and attach this adapter to it.
    ListView listView = (ListView) rootView.findViewById(R.id.home_list);
    listView.setAdapter(homeListAdapter);

    return rootView;
}
}

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.exampleApp" >

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.exampleTheme" >
    <activity
        android:name=".HomeActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

build.gradle:

apply plugin: 'com.android.application'

android {
compileSdkVersion 22
buildToolsVersion "22.0.1"

defaultConfig {
    applicationId "com.example.exampleApp"
    minSdkVersion 14
    targetSdkVersion 22
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.+'
compile 'com.github.navasmdc:MaterialDesign:1.5@aar'
compile 'com.balysv:material-ripple:1.0.2'
}

Answer 1

您已导入android.R,仅包含核心框架资源.您需要将其更改为com.example.package.R,com.example.package您的应用程序资源包名称在哪里.

编辑(MashedPotatoes):我强行将JPG文件作为PNG而没有正确的转换,这就是造成错误的原因.但原始错误是由导入引起的android.R,而不是com.example.package.R,因此将此标记为正确.